Peculiarities of the Spin Wave Spectrum in Transversely Confined YIG Microwaveguides with Inhomogeneous Magnetization Profile

IF 1.1 4区 材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING Physics of Metals and Metallography Pub Date : 2024-07-08 DOI:10.1134/s0031918x23603220
Y. V. Aleksandrova, E. N. Beginin, S. E. Sheshukova, A. V. Sadovnikov
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Abstract

A study of spin wave spectra in a two-layer structure of iron–yttrium garnet (YIG) with different magnitudes of the saturation magnetizations of the layers has been carried out. Different modes of spin wave propagation (reciprocal, nonreciprocal, single-wave) depending on the type of structure and width of the central waveguide are investigated. The classification of spin wave spectra is carried out, and the class of guided, outgoing, and edge spin modes is identified. In particular, it is shown that in a system of planar magnetic comb-type LS-type \(({{M}_{{{\text{s}}1}}} < {{M}_{{{\text{s2}}}}})\) microwaveguide tubes with periodic boundary conditions, two non-contiguous frequency regions of existence of guided modes of the central waveguide are observed for a width w of the central waveguide. Two adjacent frequency regions exist in the system of planar magnetic comb-type HS-type \(({{M}_{{{\text{s}}1}}} > {{M}_{{{\text{s}}2}}})\) microwaveguide tubes at any values of the width of the central waveguide: in the high-frequency region, the mode with outflowing modes of the structure is realized, while in the low-frequency region, the mode with guided modes of the central waveguide is realized. It is shown that in systems of both types in the region of strongly inhomogeneous magnetic fields there can exist modes of boundary waves having a mutual character of propagation. The results obtained can be used to expand and clarify the physics of wave processes in complicated magnetic structures.

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具有不均匀磁化曲线的横向约束 YIG 微波导管中自旋波谱的特殊性
摘要 研究了铁钇石榴石(YIG)双层结构中的自旋波谱,各层的饱和磁化率不同。根据结构类型和中央波导的宽度,研究了自旋波的不同传播模式(往复、非往复、单波)。对自旋波频谱进行了分类,并确定了引导、传出和边缘自旋模式的类别。研究特别表明,在一个具有周期性边界条件的平面磁梳型 LS 型(({{M}_{{text/{s}}1}}} < {{M}_{{text/{s2}}}}})/)微波导管系统中,对于中心波导的宽度 w,可以观察到中心波导存在两个非连续的导波模式频率区。在中心波导宽度为任意值时,平面磁梳型 HS 型(({{M}_{\text{s}}1}} > {{M}_{\text{s}}2}})微波导管系统中存在两个相邻的频率区域:在高频区域,实现了结构的外流模式,而在低频区域,实现了中心波导的引导模式。研究表明,在这两种类型的系统中,在强不均匀磁场区域,可能存在具有相互传播特性的边界波模式。所获得的结果可用于扩展和阐明复杂磁结构中波过程的物理学原理。
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来源期刊
Physics of Metals and Metallography
Physics of Metals and Metallography 工程技术-冶金工程
CiteScore
2.00
自引率
25.00%
发文量
108
审稿时长
3 months
期刊介绍: The Physics of Metals and Metallography (Fizika metallov i metallovedenie) was founded in 1955 by the USSR Academy of Sciences. Its scientific profile involves the theory of metals and metal alloys, their electrical and magnetic properties, as well as their structure, phase transformations, and principal mechanical properties. The journal also publishes scientific reviews and papers written by experts involved in fundamental, application, and technological studies. The annual volume of publications amounts to some 250 papers submitted from 100 leading national scientific institutions.
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